Keyboard



FIG. 1 is a front perspective view of a keyboard;

FIG. 2 is a back perspective view of the keyboard;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a back elevation view thereof;

FIG. 5 is a right elevation view thereof;

FIG. 6 is a left elevation view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof. 

We claim the ornamental design for a keyboard, as shown and described. 